<template>
  <footer class="footer">
    <span class="todo-count" v-show="leftListLength"
      ><strong>{{ leftListLength }}</strong
      >剩余</span
    >
    <ul class="filters">
      <li>
        <a
          :class="{ selected: type === 'all' }"
          href="#/"
          @click="changeType('all')"
          >全部</a
        >
      </li>
      <li>
        <a
          :class="{ selected: type === 'active' }"
          href="#/active"
          @click="changeType('active')"
          >进行中</a
        >
      </li>
      <li>
        <a
          :class="{ selected: type === 'completed' }"
          href="#/completed"
          @click="changeType('completed')"
          >已完成</a
        >
      </li>
    </ul>
    <button class="clear-completed" @click="clearDoneList" v-show="isDoneAll">
      清除已完成
    </button>
  </footer>
</template>

<script>
export default {
  name: 'TodoFooter',
  props: {
    leftListLength: {
      type: Number,
      required: true,
    },
    isDoneAll: {
      type: Boolean,
      required: true,
    },
    type: {
      type: String,
      required: true,
    },
  },

  methods: {
    clearDoneList() {
      this.$emit('clearDoneList')
    },

    //修改父组件中的type
    changeType(type) {
      this.$emit('changeType', type)
    },
  },
}
</script>

<style scoped></style>
